Custom Dimensions Assign any custom data to your visitors or actions (like pages, events, …) and then visualize the reports of how many visits, conversions, pageviews, etc. there were for each Custom Dimension.

Custom Variables similar to Custom Dimensions: custom name-value pair that you can assign to your visitors (or page views) using the JavaScript Tracking API, and then visualize the reports of how many visits, conversions, etc. for each custom variable.

User Flow is a awesome visual representation of the most popular paths your users took through your website or app. Get more insights by analyzing those paths and where along in the path they exited your site.